Magyar menüt kérek. Show menu in Hungarian

Monthly archives: szeptember, 2020

Estimating the length of planetary videos

There’s a legend among amateur astronomers that, without derotation, Jupiter supports only 90 seconds of raw video. Anything above it: derotate.

It always felt fishy to me, even before I started doing planetary photography. Due to other reasons, like capturing the moons’ movement, and the interplay of shadows, I always tried to keep the videos short.

However, the subject is evergreen wherever there are newcomers. So, now I made the math, and since we are people, not mathboys, here’s a handy little table one can play with or scroll below, the same calculator loads into this article.



Jupiter, Ganymede, Io 2020-08-29

HEQ5, N250/1200, TSO ADC, ASI 462MC (cooled), home observatory, mountpusher


Jól kalibrált monitoron mindegyik számnál elkülönülő árnyalat látszik. Ha mégsem látszanak, akkor a megjelenített képek színhiányosan rajzolódnak ki. A monitort valószínűleg kalibrálni kell.

You should see distinct shades for each number. If those shades are not clearly visible, the displayed pictures will lack accuracy. Your display most likely needs to be calibrated (brightness, gamma, contrast etc.).